#include "../Eigen/Sparse"

using namespace Eigen;

void
call_ref(Ref<SparseMatrix<float>> a)
{
}

int
main()
{
	SparseMatrix<float> a(10, 10);
	SparseMatrixBase<SparseMatrix<float>>& ac(a);
#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
	call_ref(ac);
#else
	call_ref(ac.derived());
#endif
}
